/*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* Copyright (c) 2020 Andrey Semashev
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*/
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/*!
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* \file atomic/detail/caps_arch_gcc_aarch64.hpp
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*
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* This header defines feature capabilities macros
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*/
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#ifndef BOOST_ATOMIC_DETAIL_CAPS_ARCH_GCC_AARCH64_HPP_INCLUDED_
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#define BOOST_ATOMIC_DETAIL_CAPS_ARCH_GCC_AARCH64_HPP_INCLUDED_
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#include <boost/atomic/detail/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#if defined(__AARCH64EL__) || \
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(defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) || \
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(defined(__LITTLE_ENDIAN__) && !defined(__BIG_ENDIAN__)) || \
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defined(BOOST_WINDOWS)
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#define BOOST_ATOMIC_DETAIL_AARCH64_LITTLE_ENDIAN
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#elif defined(__AARCH64EB__) || \
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defined(__ARM_BIG_ENDIAN) || \
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(defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
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(defined(__BIG_ENDIAN__) && !defined(__LITTLE_ENDIAN__))
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#define BOOST_ATOMIC_DETAIL_AARCH64_BIG_ENDIAN
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#else
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#error "Boost.Atomic: Failed to determine AArch64 endianness, the target platform is not supported. Please, report to the developers (patches are welcome)."
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#endif
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#if defined(__ARM_FEATURE_ATOMICS)
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// ARMv8.1 added Large System Extensions, which includes cas, swp, and a number of other read-modify-write instructions
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#define BOOST_ATOMIC_DETAIL_AARCH64_HAS_LSE
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#endif
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#if defined(__ARM_FEATURE_COMPLEX)
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// ARMv8.3 added Release Consistency processor consistent (RCpc) memory model, which includes ldapr and similar instructions.
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// Unfortunately, there seems to be no dedicated __ARM_FEATURE macro for this, so we use __ARM_FEATURE_COMPLEX, which is also defined starting ARMv8.3.
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#define BOOST_ATOMIC_DETAIL_AARCH64_HAS_RCPC
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#endif
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#define BOOST_ATOMIC_INT8_LOCK_FREE 2
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#define BOOST_ATOMIC_INT16_LOCK_FREE 2
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#define BOOST_ATOMIC_INT32_LOCK_FREE 2
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#define BOOST_ATOMIC_INT64_LOCK_FREE 2
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#define BOOST_ATOMIC_INT128_LOCK_FREE 2
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#define BOOST_ATOMIC_POINTER_LOCK_FREE 2
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#define BOOST_ATOMIC_THREAD_FENCE 2
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#define BOOST_ATOMIC_SIGNAL_FENCE 2
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#endif // BOOST_ATOMIC_DETAIL_CAPS_ARCH_GCC_AARCH64_HPP_INCLUDED_
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